It occurs on a normal “old” hardware-comm and even on “modern” USB-Serial-Ports! You can see it on every windows-machine with a simple LED-Tester. It is a fact, that windows sometimes sends pulses on TX and DTR even if no software using the port is running! I think the behavior occurs because windows or a driver is checking if new hardware is available.Īnd the maestro accepts and receives these pulses even when the statuslines are in off state. Windows or the driver does not activate the serial-statuslines! Only sends pulses on TX. My serial tester (hardware) show the sporadic datas on the TX-Line too when I replace the maestro with the tester. And suddenly without using my programm it goes to red error. Some minutes after the last command the red led stays off. In my new Excelmacro für controlling the Maestro I clear the errorstatus before each normal command. And we had a lot problems with measurmentmachines and euipment because of these “phantomdata” I had a lot to do with serial communication and measurement equipment in my job. ![]() With WIN 95/98/XP, WIN 7 and WIN 10 on many differnet computers and laptops. ![]() This behavior is known since Windows exist. periodically sends commands on all available ports. It is connected and connected to powerer. This erros occur even when I do not use the Maestro.
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